TM 5-3810-300-24&P-3
2.7.1
LIMITING SPEED MECHANICAL GOVERNOR
The limiting speed mechanical governor, illustrated in Fig. 1,
performs the following functions:
1. Controls the engine idling speed.
2. Limits the maximum operating speed of the engine.
The governor is mounted on the front end of the blower and is
driven by the upper blower rotor, (Fig. 2). The governor
consists of three subassemblies:
1. Control Housing Cover.
2. Control Housing.
3. Weights and Housing.
The governor provides full fuel for starting when the speed
control lever is in the idle position.
Immediately after starting, the governor moves the injector
racks to that position required for idling.
Grove Crane Application
Governor Operation
The centrifugal force of the revolving governor weights (272
and 273) is converted into linear motion which is transmitted
through the riser (67) and operating shaft (26) to the operating
shaft lever (27). One end of lever (27) operates against the
high and low speed springs (48 and 46) through the spring cap
(47), while the other end provides a moving fulcrum on which
the differential lever (23) pivots.
When the centrifugal force of the revolving governor weights
balances out the tension on the high or low speed spring
(depending on the speed range), the governor stabilizes the
engine speed for a given setting of the governor control lever.
In the low speed range, the centrifugal force of the low speed
weights operates against the low speed spring. As the engine
speed increases, the centrifugal force of the low speed
weights compresses the low speed spring until the weights are
against their stops, thus limiting their travel, at which time the
low speed spring is fully compressed and the low speed cap is
against the high speed plunger.
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